Testing Elixir

Testing with ExUnit

From the beginning, Elixir was developed with ExUnit, the test framework, as part of the core library. As a result, most of the test tooling we’ve come to utilize in our production applications is straight out of the Elixir core. This means that if you have Elixir and you’re familiar with what’s available, you can write effective tests without needing to bring in other libraries.

To learn how to use ExUnit, we’re going to start by writing our first test and then discuss some test theory, specifically the stages of testing. We’ll look at how to organize test files and then explore using common Elixir to help maximize the effectiveness of our tests. Finally, we’ll cover how to design code so that it’s well organized and easy ...